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《Environmental Science & Technology》 2017-01
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Experimental Study of Factors Affecting Environmental Dredging

LEI Xiaoling;LEI Yu;Chongqing Academy of Science and Technology;School of River & Ocean Engineering, Chongqing Jiaotong University;  
A laboratory experiment was conducted in order to study the factors affecting the environmental dredging of navigation channel with the sediment samples grabbed from the river bottom near the Lijiatuo wharf in Three Gorges Reservoir area,where the river water had been contaminated.Into the sediment samples were added the passivants,i.e.PAC and calcium nitrate,respectively,and after seven days different kinds of reamers,i.e.the normal dredging reamer,normal reamer with cover,environmental spiral reamer and environmental spiral reamer with cover were respectively used for simulative dredging.Then the pollutants such as COD,TP,TN and NH_3-N released into the overlying water were investigated within 48 h after the end of dredging work.In conclusion,experimental study suggested that,in terms of the released quantity of pollutants,addition of PAC was better than that of calcium nitrate;in addition,the environmental spiral reamer was better than the normal reamer in regards to the effect of dredging.
【Fund】: 国家科技支撑计划项目:三峡水库常年回水区航运工程建设关键技术研究(2011BAB09B01);; 重庆市科技研发基地建设计划项目(国际科技合作):中-加三峡水域国际科技合作示范基地(cstc2013gjhz20001)
【CateGory Index】: X52
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